State three advantages of using Automatic Gain Control (AGC) in a TV Teceiver.June/July 2020

Automatic Gain Control (AGC) is a circuit that is used to maintain a constant signal level in a TV receiver by automatically adjusting the gain of the amplifier stages. AGC has several advantages in a TV receiver:

1. Improved signal-to-noise ratio: AGC helps to maintain a constant signal level, which reduces the effects of noise and interference on the received signal. This results in an improved signal-to-noise ratio and a clearer, more stable picture.
2. Enhanced reception: AGC allows the receiver to operate over a wider range of signal strengths, which makes it more versatile and improves its ability to receive weak signals.
3. Reduced distortion: AGC helps to prevent overloading of the amplifier stages, which can cause distortion in the received signal. By keeping the signal level within a certain range, AGC reduces distortion and improves the quality of the received picture.
4. Enhanced dynamic range: AGC allows the receiver to operate over a wider range of signal levels, which increases its dynamic range and makes it more tolerant of signal variations.
5. Simplified receiver design: AGC reduces the need for manual gain adjustments, which simplifies the design of the receiver and makes it easier to use.